Truing-up gage.



G. W. FREEMAN;

, TRUING-UP GAGE.

APPLICATION FILED JULY 12, 1909. RENBWED SEPT. 27, 1912.

1,047,51 1 Patented Dec. 17, 1912.

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GEORGE W. FREEMAN, 0F REVERE, MASSACHUSETTS.

TRUINGr-UP GAGE.

Application led July 12, 1909, Serial No. 507,130.

Specification of Letters Patent.

Patented Dec. 17, 1912.

Renewed September 27, 1912. Serial No. 722,762.

To all whom it may concern:

Be it known that I, GEORGE FREEMAN, a citizen of the United States, residing at Revere, county of Suffolk, and State of Massachusetts, have invented an Improvement in Truing-Up Gages, of which the following description, in connection with the accompanying drawing, is a specication, like characters on the drawing representing like parts.

This invention relates to truing-up gages, such as are used morey or less commonly for indicating if any piece of work in a lathe, milling machine, or other metal-working machine, is properly trued up.

The principal object of my invention is to provide a truing-up gage which is universal in its use, that is, which can be used for truing up either an interior cylindrical surface, an exterior cylindrical surface, a plane reciprocating surface, or a prick-punch center.

One embodiment of the invention will first be described and then the novel features thereof will be pointed out in the appended claims.

In the drawings, Figure 1 is a view partly in elevation and partly in section showing one embodiment of my invention as it would be used in truing up a cylindrical interior surface; Fig. 2 is a fragmentary view showing the device as it would be used for truing up a prick-punch center; Fig. 3 is a view showing the way the invention would be used in truing up a plane reciprocating surface; Fig. 4 is a section on the line ae44, Fig. 1. Fig. 5 is a section on the line 5#5, Fig. 1.

The device comprises a frame or body 3 having a chamber or bore in which is received a reciprocatory plunger 4, the latter being preferably guided in its reciprocations by a suitable guide pin 5 which extends through a slot in the plunger. The plunger is provided with a slot or recess 6 in which is received a member 7 having a hooked end, said member being pivoted to the plunger at 8. The hooked end of this member engages the short arm 9 of a pointer or indicating member 10 that is pivoted to the frame at 11 and plays over a scale 12 formed on an arm 13. The movement of the plunger to the right Fig. 1 will obviously raise the pointer into or toward the dotted line posi tion. The pointer will be returned to its zero position by any suitable means.

The frame 3 is provided with a projection 14 which is adapted to support a feeler whichis arranged to engage the surface of the work which is to be truedl up. I preferably make'the feeler detachable from the projection 14 so that feelers of different shapes may be employed, and as herein shown I support the feeler on a holder 15 which is adapted to slip over and be received on the end of the projection 14. The feeler is pivoted to the holder and is provided with a finger to engage the surface or portion of the work to be t-rued up and with another finger or arm adapted to engage the end of thc plunger. In the embodiment shown in Fig. 1, the feeler is adapted for use in truing up an interior cylindrical surface,

'and it is pivoted to the holder at 16 and is provided with a feeler finger 17 and with the arm 18 which extends laterally from the feeler finger and engages the end of the plunger 4. If it be assumed that the work 19 having an interior cylindrical surface 20 to be trued up is rotating about the dotted line 21 as an axis, then it will be seen that if the surface Q0 is not concentric with the axis, the feeler will be turned about the pivot 16 and the plunger 4 will be moved to the right or left, thus causing a movement of the indicating nger 10. By watching the movement of the indicating nger, therefore, it is possible to determine accurately whether the surface 2O is true or not.

In truing up a prick-punch center, as seen in Fig. 2, I use a different form of feeler, that is, one which is connected to the holder 15 with a ball-and-socket connection 22 and which is provided with the straight feeler finger 17a and the laterally-extending arm 18 that is adapted to engage the plunger 4. In using a device of this construction the end of the feeler finger 17a is placed in the extends through a slot therein.

prick-punch center 25 in the end of the work 26 and if when said work is rotated the prick-punch center is not in the axis of motion, the feeler finger will have a wabbling motion around the axis of rotation 21, and such wabbling motion will give a reciprocating motion to the plunger 4 and thereby to the indicating member 10.

If the device is to be used for truing or leveling up a olane reciprocating surface,

such as the sur ace of a piece of work in a planer or milling machine, the form of feeler shown in Fig. 3 may be used. This feeler has the feeler linger 27, the end of which is bent laterally in a direction opposite to the arm 18. In using this device it is placed with the end of the arm 27 standing at substantially right angles to the face 30 of the work 31 that is to be trued up, and as said Work moves in the direction of the arrow, if the surface 80 lis not level, the feeler 27 will be moved thereby giving movement to the indicating linger 10. By making the holder 15 detachable from the projection 14, it is possible to use any one of the above-described feelers and thus to use the instrument in a great variety of ways.

I will preferably make the projection 14 so that it can yield relative to the frame, and as herein shown, said projection is slidably received in a socket 310 formed in the frame 3 and is backed by a spring 32, said projection being limited and guided in its reciprocating movement by a pin 88 which The advantage of making the projection 14 yielding is that when the device is used as shown in Fig. 2 for truing up a prick punch center, the feeler can yield longitudinally to accom` modate any uneven movement of the portion of the work having the prick punch center therein. The holders 15 may if desired be provided with a locking catch 34 by which they may be locked to the projections.

The frame 3 may be supported on the lathe, milling machine or other machine in any suitable way without departing from my invention. ,In the embodiment herein illustrated the frame 3 is swiveled on a rod 40 which extends through a bearing 41 on the frame and is provided with a pointed end or center 42 which is received in a recess formed in the frame. The frame is clamped to the rod by means of a clamping screw 44. The rod extends through a post 45, and the latter has swiveled thereto a laterally-extending arm 46 which is adapted to be clamped to any fixed support, such as 47. The arm 46 is shown as having a hub 70 through which extends a clamping screw 72. This clamping screw has at itsupper end an eye through which the rod 40 extends and said screw has a clamping nut 71 thereon so that by screwing up nut 71 the postl 45 will be clamped to the rod 40 and said post will be clamped to the arm 46. The arm 46 can swing about the post 45 as an axis, and said post and rod 40 can turn about the axis of said rod so that it is possible to support the frame 3 in any desired position from almost any support. l/Vhen the frame is in a vertical position, the weight of the pointer 10 is sufficient to return it to Zero position.

I have shown the arm 13 as pivoted to the frame at 50 so that when the device is not in use, said arm can be folded down against the frame. The advantage of this is that the device can be folded into a small space and can, therefore, be packed in a comparatively small box.

Having fully described my invention, what I claim as new and desire to secure by Letters Patent is l. In a truing-up gage, the combination with a frame, of an indicating pointer pivoted thereto, a plunger slidably sustained by the frame, a hook-shaped member pivoted to the plunger and adapted to engage the pointer, and a feeler pivoted to the frame and provided with a lateral arm to engage the end of the plunger.

2. In a truing-up gage, the combination with a frame, of an indicating pointer pivoted thereto and provided with an arm, a plunger slidably sustained by the frame, a hook-shaped member pivoted to the plunger and engaging the arm of the pointer, and a feeler pivoted to the frame and provided with a lateral arm to engage the end of the plunger.

3. In a device of the class described, the combination with a frame, of a feeler pivoted thereto, a plunger slidably carried by the frame and operated by the feeler, a pointer actuated by the plunger, a rod 40 on which the frame is mounted to turn, a post supporting said rod, and a clamp swiveled to the post.

4. In a truing-up gage, the combination with a frame, of an indicating pointer pivoted thereto, a slotted plunger slidably sustained by the frame, a hook-shaped member pivoted to the plunger and received' in the slot therein, the hooked end of saidmember engaging the pointer, and a feeler pivoted to the frame and provided with a lateral arm to engage the end of the plunger.

5. In a truing-up gage, the combination with a frame, of a plunger slidably sustained thereby, an indicatingl pointer actuated by the plunger, ayielding projection also sustained by the frame, and a feeler carried by said projection and having a lateral arm to engage the plunger.

6. In a truing-up gage, the combination with a frame, of a plunger slidably mounted therein, a feeler pivoted to the frame and adapted to actuate the plunger, a pointer pivoted to the frame and adapted to assume name to this specification, in the presence of its zero position by gravity, and connectiois two subscribing witnesses. between the plunger and pointer where y movement of the plunger caused by a feeling GEORGE W FREEMAN' 5 movement of the feeler will raise the pointer Witnesses: A v

against the action of gravity. LOUIS C. SMITH,

In testimony whereof, I have signed my THOMAS J. DRUMMOND.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

